Hunting Patterns and Bifurcation Characteristics of a Railway Bogie on Curved Track
Based on the case of a two-axle railway bogie running on a curved track,the hunting patterns and bifurcation characteristics of the bogie in the presence of the flange contact nonlinearity were discussed through the two-dimensional parameter variable bifurcation diagram.The dynamics and differences of the bogie system with unworn and worn wheel-sets were compared to analyze the influence of wheel tread profile changes caused by wear on the hunting characteristics of the bogie system.By revealing the incidence relation between hunting patterns and bifurcation characteristics of the bogie system and its key parameters,the parameter sensitivity and reasonable matching range were determined,which provided a theoretical basis for the comprehensive design and optimal combination of railway vehicle suspension parame-ters.The results show that the impacts of the leading and trailing wheelsets on the rail begin with the impact of wheel flange on the outer rail.Regardless of the new wheel period or wear period,the impact of the trailing wheelsets on the in-ner and outer rails falls behind that of the leading wheelsets,while the impact strength of the leading wheelsets on the rail is greater than that of the trailing wheelsets,especially in the wear period.The changes in the wheel tread profile have a great influence on the instability speed of the period 1 hunting mode,which is mainly caused by period doubling bifurcation and Neimark-Sacker bifurcation.
NETL
NSTL
万方数据
